It appears as though Sharepoint 2010 OOB does not give Authenticated Users "contribute" permissions for users' blog comment lists. Authenticated Users only have the permission to read, which is not ideal in a corporate setting. Our employees want feedback to what they post on their my site blog.

How would you recommend changing this permission? We have already created a little utility to go through all the existing user profiles and change the permission on their comment list. But what about when a future user sets up their blog for the first time? Is there a way to change this default permission setting for future users?

My only idea at the moment is to set up an event receiver for when a new site is created. But then it would run every single time that a site provisions and it would have to check to see if it's a blog site.

@Sabrina, an alternative to your idea of an event receiver would be a custom feature with a feature receiver that sets up the permissions. You could then use feature stapling to staple the feature only to blog sites.